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<html lang="en">
<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var arr = [1,2,3,4,5]
        // function reverse(arr){
        //     var newarr=[];
        //     for(var i = arr.length-1;i>=0;i--){
        //         newarr.push(arr[i]);
        //     }
        //     return newarr
        // }
        // console.log(reverse(arr))
        arr.reverse()
        console.log(arr);
    </script>
</body>
</html>